#Performance

I recently embarked upon a performance investigation to figure out why a particular operation was slow. My theory was that it was the serialization/deserialization cost with a set of large objects; my colleague’s theory was the iteration over the set. We were both wrong.
The investigation became intriguing when we started measuring the elapsed time at various points in the application and noticed that the bulk of the time was being spent in a seemingly innocuous call to construct a HashSet from an existing Collection.
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